1. Preheat oven to 400°.
2. Pierce potatoes with a fork; place on a baking sheet. Bake at 400° for 1 hour and 15 minutes or until done. Cool slightly. Cut each potato in half lengthwise; scoop out pulp, leaving a 1/4-inch-thick shell. Combine potato pulp, butter, chiles, adobo, and salt in a food processor. Finely chop white bottom part of onions; add to pulp mixture. (Reserve green onion tops.) Pulse mixture 5 times to combine.
3. Arrange potato shells on baking sheet. Spoon potato mixture into shells. Bake at 400° for 10 minutes or until hot. Thinly slice green top part of onions, and sprinkle over potatoes.